do the subwoofer need both left and right channel ? try hda-analyer to change the volume sliders of audio mixer which is connected to subwoofet (node 0x0d ?)
speaker-test -c2 -t wave -D hw:0,0 do it work with 2.1 mode ? https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/1286021 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1302090 Title: Dell Alienware 14, Speaker sound output is mono until a headphone jack is plugged To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1302090/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs